How to use the llvmlite.binding.ffi.lib function in llvmlite

def struct_types(self):
        """
        Return an iterator over the struct types defined in
        the module. The iterator will yield a TypeRef.
        """
        it = ffi.lib.LLVMPY_ModuleTypesIter(self)
        return _TypesIterator(it, dict(module=self))

ffi.lib.LLVMPY_PassManagerBuilderSetSizeLevel,
              ffi.lib.LLVMPY_PassManagerBuilderUseInlinerWithThreshold,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef, c_uint]

for _func in (ffi.lib.LLVMPY_PassManagerBuilderGetOptLevel,
              ffi.lib.LLVMPY_PassManagerBuilderGetSizeLevel,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef]
    _func.restype = c_uint

# Boolean PassManagerBuilder properties

for _func in (ffi.lib.LLVMPY_PassManagerBuilderSetDisableUnrollLoops,
              ffi.lib.LLVMPY_PassManagerBuilderSetLoopVectorize,
              ffi.lib.LLVMPY_PassManagerBuilderSetSLPVectorize,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef, c_bool]

for _func in (ffi.lib.LLVMPY_PassManagerBuilderGetDisableUnrollLoops,
              ffi.lib.LLVMPY_PassManagerBuilderGetLoopVectorize,
              ffi.lib.LLVMPY_PassManagerBuilderGetSLPVectorize,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef]
    _func.restype = c_bool

ffi.lib.LLVMPY_InvokeInstAttributesIter.restype = ffi.LLVMAttributeListIterator

ffi.lib.LLVMPY_GlobalAttributesIter.argtypes = [ffi.LLVMValueRef]
ffi.lib.LLVMPY_GlobalAttributesIter.restype = ffi.LLVMAttributeSetIterator

ffi.lib.LLVMPY_ArgumentAttributesIter.argtypes = [ffi.LLVMValueRef]
ffi.lib.LLVMPY_ArgumentAttributesIter.restype = ffi.LLVMAttributeSetIterator

ffi.lib.LLVMPY_FunctionBlocksIter.argtypes = [ffi.LLVMValueRef]
ffi.lib.LLVMPY_FunctionBlocksIter.restype = ffi.LLVMBlocksIterator

ffi.lib.LLVMPY_FunctionArgumentsIter.argtypes = [ffi.LLVMValueRef]
ffi.lib.LLVMPY_FunctionArgumentsIter.restype = ffi.LLVMArgumentsIterator

ffi.lib.LLVMPY_BlockInstructionsIter.argtypes = [ffi.LLVMValueRef]
ffi.lib.LLVMPY_BlockInstructionsIter.restype = ffi.LLVMInstructionsIterator

ffi.lib.LLVMPY_InstructionOperandsIter.argtypes = [ffi.LLVMValueRef]
ffi.lib.LLVMPY_InstructionOperandsIter.restype = ffi.LLVMOperandsIterator

ffi.lib.LLVMPY_DisposeAttributeListIter.argtypes = [ffi.LLVMAttributeListIterator]

ffi.lib.LLVMPY_DisposeAttributeSetIter.argtypes = [ffi.LLVMAttributeSetIterator]

ffi.lib.LLVMPY_DisposeBlocksIter.argtypes = [ffi.LLVMBlocksIterator]

ffi.lib.LLVMPY_DisposeInstructionsIter.argtypes = [ffi.LLVMInstructionsIterator]

ffi.lib.LLVMPY_DisposeOperandsIter.argtypes = [ffi.LLVMOperandsIterator]

ffi.lib.LLVMPY_AttributeListIterNext.argtypes = [ffi.LLVMAttributeListIterator]
ffi.lib.LLVMPY_AttributeListIterNext.restype = c_char_p

Return an iterator over this value's attributes.
        The iterator will yield a string for each attribute.
        """
        itr = iter(())
        if self.is_function:
            it = ffi.lib.LLVMPY_FunctionAttributesIter(self)
            itr = _AttributeListIterator(it)
        elif self.is_instruction:
            if self.opcode == 'call':
                it = ffi.lib.LLVMPY_CallInstAttributesIter(self)
                itr = _AttributeListIterator(it)
            elif self.opcode == 'invoke':
                it = ffi.lib.LLVMPY_InvokeInstAttributesIter(self)
                itr = _AttributeListIterator(it)
        elif self.is_global:
            it = ffi.lib.LLVMPY_GlobalAttributesIter(self)
            itr = _AttributeSetIterator(it)
        elif self.is_argument:
            it = ffi.lib.LLVMPY_ArgumentAttributesIter(self)
            itr = _AttributeSetIterator(it)
        return itr

ffi.lib.LLVMPY_RunPassManager.argtypes = [ffi.LLVMPassManagerRef,
                                          ffi.LLVMModuleRef]
ffi.lib.LLVMPY_RunPassManager.restype = c_bool

ffi.lib.LLVMPY_InitializeFunctionPassManager.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_InitializeFunctionPassManager.restype = c_bool

ffi.lib.LLVMPY_FinalizeFunctionPassManager.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_FinalizeFunctionPassManager.restype = c_bool

ffi.lib.LLVMPY_RunFunctionPassManager.argtypes = [ffi.LLVMPassManagerRef,
                                                  ffi.LLVMValueRef]
ffi.lib.LLVMPY_RunFunctionPassManager.restype = c_bool

ffi.lib.LLVMPY_AddConstantMergePass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddDeadArgEliminationPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddFunctionAttrsPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddFunctionInliningPass.argtypes = [ffi.LLVMPassManagerRef, c_int]
ffi.lib.LLVMPY_AddGlobalDCEPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddGlobalOptimizerPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddIPSCCPPass.argtypes = [ffi.LLVMPassManagerRef]

ffi.lib.LLVMPY_AddDeadCodeEliminationPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddCFGSimplificationPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddGVNPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddInstructionCombiningPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddLICMPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddSCCPPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddSROAPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddTypeBasedAliasAnalysisPass.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_AddBasicAliasAnalysisPass.argtypes = [ffi.LLVMPassManagerRef]

ffi.lib.LLVMPY_PassManagerBuilderPopulateModulePassManager.argtypes = [
    ffi.LLVMPassManagerBuilderRef,
    ffi.LLVMPassManagerRef,
]

ffi.lib.LLVMPY_PassManagerBuilderPopulateFunctionPassManager.argtypes = [
    ffi.LLVMPassManagerBuilderRef,
    ffi.LLVMPassManagerRef,
]

# Unsigned int PassManagerBuilder properties

for _func in (ffi.lib.LLVMPY_PassManagerBuilderSetOptLevel,
              ffi.lib.LLVMPY_PassManagerBuilderSetSizeLevel,
              ffi.lib.LLVMPY_PassManagerBuilderUseInlinerWithThreshold,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef, c_uint]

for _func in (ffi.lib.LLVMPY_PassManagerBuilderGetOptLevel,
              ffi.lib.LLVMPY_PassManagerBuilderGetSizeLevel,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef]
    _func.restype = c_uint

# Boolean PassManagerBuilder properties

for _func in (ffi.lib.LLVMPY_PassManagerBuilderSetDisableUnrollLoops,
              ffi.lib.LLVMPY_PassManagerBuilderSetLoopVectorize,
              ffi.lib.LLVMPY_PassManagerBuilderSetSLPVectorize,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef, c_bool]

]

ffi.lib.LLVMPY_PassManagerBuilderPopulateFunctionPassManager.argtypes = [
    ffi.LLVMPassManagerBuilderRef,
    ffi.LLVMPassManagerRef,
]

# Unsigned int PassManagerBuilder properties

for _func in (ffi.lib.LLVMPY_PassManagerBuilderSetOptLevel,
              ffi.lib.LLVMPY_PassManagerBuilderSetSizeLevel,
              ffi.lib.LLVMPY_PassManagerBuilderUseInlinerWithThreshold,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef, c_uint]

for _func in (ffi.lib.LLVMPY_PassManagerBuilderGetOptLevel,
              ffi.lib.LLVMPY_PassManagerBuilderGetSizeLevel,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef]
    _func.restype = c_uint

# Boolean PassManagerBuilder properties

for _func in (ffi.lib.LLVMPY_PassManagerBuilderSetDisableUnrollLoops,
              ffi.lib.LLVMPY_PassManagerBuilderSetLoopVectorize,
              ffi.lib.LLVMPY_PassManagerBuilderSetSLPVectorize,
              ):
    _func.argtypes = [ffi.LLVMPassManagerBuilderRef, c_bool]

for _func in (ffi.lib.LLVMPY_PassManagerBuilderGetDisableUnrollLoops,
              ffi.lib.LLVMPY_PassManagerBuilderGetLoopVectorize,
              ffi.lib.LLVMPY_PassManagerBuilderGetSLPVectorize,

ffi.lib.LLVMPY_GetProcessTriple.argtypes = [POINTER(c_char_p)]

ffi.lib.LLVMPY_GetHostCPUFeatures.argtypes = [POINTER(c_char_p)]
ffi.lib.LLVMPY_GetHostCPUFeatures.restype = c_int

ffi.lib.LLVMPY_GetDefaultTargetTriple.argtypes = [POINTER(c_char_p)]

ffi.lib.LLVMPY_GetHostCPUName.argtypes = [POINTER(c_char_p)]

ffi.lib.LLVMPY_GetTripleObjectFormat.argtypes = [c_char_p]
ffi.lib.LLVMPY_GetTripleObjectFormat.restype = c_int

ffi.lib.LLVMPY_CreateTargetData.argtypes = [c_char_p]
ffi.lib.LLVMPY_CreateTargetData.restype = ffi.LLVMTargetDataRef

ffi.lib.LLVMPY_CopyStringRepOfTargetData.argtypes = [
    ffi.LLVMTargetDataRef,
    POINTER(c_char_p),
]

ffi.lib.LLVMPY_DisposeTargetData.argtypes = [
    ffi.LLVMTargetDataRef,
]

ffi.lib.LLVMPY_ABISizeOfType.argtypes = [ffi.LLVMTargetDataRef,
                                         ffi.LLVMTypeRef]
ffi.lib.LLVMPY_ABISizeOfType.restype = c_longlong

ffi.lib.LLVMPY_OffsetOfElement.argtypes = [ffi.LLVMTargetDataRef,
                                           ffi.LLVMTypeRef,
                                           c_int]
ffi.lib.LLVMPY_OffsetOfElement.restype = c_longlong

POINTER(c_char_p),
]
ffi.lib.LLVMPY_RemoveModule.restype = c_bool

ffi.lib.LLVMPY_AddModule.argtypes = [
    ffi.LLVMExecutionEngineRef,
    ffi.LLVMModuleRef
]

ffi.lib.LLVMPY_AddGlobalMapping.argtypes = [ffi.LLVMExecutionEngineRef,
                                            ffi.LLVMValueRef,
                                            c_void_p]

ffi.lib.LLVMPY_FinalizeObject.argtypes = [ffi.LLVMExecutionEngineRef]

ffi.lib.LLVMPY_GetExecutionEngineTargetData.argtypes = [
    ffi.LLVMExecutionEngineRef
]
ffi.lib.LLVMPY_GetExecutionEngineTargetData.restype = ffi.LLVMTargetDataRef

ffi.lib.LLVMPY_TryAllocateExecutableMemory.argtypes = []
ffi.lib.LLVMPY_TryAllocateExecutableMemory.restype = c_int

ffi.lib.LLVMPY_GetFunctionAddress.argtypes = [
    ffi.LLVMExecutionEngineRef,
    c_char_p
]
ffi.lib.LLVMPY_GetFunctionAddress.restype = c_uint64

ffi.lib.LLVMPY_GetGlobalValueAddress.argtypes = [
    ffi.LLVMExecutionEngineRef,
    c_char_p

"""
        return ffi.lib.LLVMPY_FinalizeFunctionPassManager(self)

    def run(self, function):
        """
        Run optimization passes on the given function.
        """
        return ffi.lib.LLVMPY_RunFunctionPassManager(self, function)


# ============================================================================
# FFI

ffi.lib.LLVMPY_CreatePassManager.restype = ffi.LLVMPassManagerRef

ffi.lib.LLVMPY_CreateFunctionPassManager.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_CreateFunctionPassManager.restype = ffi.LLVMPassManagerRef

ffi.lib.LLVMPY_DisposePassManager.argtypes = [ffi.LLVMPassManagerRef]

ffi.lib.LLVMPY_RunPassManager.argtypes = [ffi.LLVMPassManagerRef,
                                          ffi.LLVMModuleRef]
ffi.lib.LLVMPY_RunPassManager.restype = c_bool

ffi.lib.LLVMPY_InitializeFunctionPassManager.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_InitializeFunctionPassManager.restype = c_bool

ffi.lib.LLVMPY_FinalizeFunctionPassManager.argtypes = [ffi.LLVMPassManagerRef]
ffi.lib.LLVMPY_FinalizeFunctionPassManager.restype = c_bool

ffi.lib.LLVMPY_RunFunctionPassManager.argtypes = [ffi.LLVMPassManagerRef,
                                                  ffi.LLVMValueRef]